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(Answer: it already technically existed — but was marketed as a wacky household cleaner to remove stickers and crayon by the likes of As Seen On TV.)
Anyhow, I really don’t think you need me to explain a pen that delivers WD-40 exactly like a Tide To Go pen delivers stain remover any further, right?
But just in case, here is a video for all you next-level pros:
And some handy illustrations so you can see how it works.
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